CN106480471B - EMD Continuous leaching process chemical combination slot pH value control devices and its control method - Google Patents

EMD Continuous leaching process chemical combination slot pH value control devices and its control method Download PDF

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Publication number
CN106480471B
CN106480471B CN201610972883.1A CN201610972883A CN106480471B CN 106480471 B CN106480471 B CN 106480471B CN 201610972883 A CN201610972883 A CN 201610972883A CN 106480471 B CN106480471 B CN 106480471B
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control
value
chemical combination
module
combination slot
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CN106480471A (en
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洪光明
谭克龙
宁甲宇
钟昭宗
陆添庆
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Ouya Automation & Equipment Co ltd Liuzhou New & High-Tech Industrial Development Zone
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Ouya Automation & Equipment Co ltd Liuzhou New & High-Tech Industrial Development Zone
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    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25BELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00Electrolytic production of inorganic compounds or non-metals
    • C25B1/01Products
    • C25B1/21Manganese oxides
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25BELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B15/00Operating or servicing cells
    • C25B15/02Process control or regulation

Abstract

EMD Continuous leaching process chemical combination slot pH value control device of the present invention and its control method, are related to field of industrial automation control.Control device includes PLC control system, operation panel, four online pH instrument, three solenoid valves, a sampling pump, three regulating valves.By operation panel input chemical combination slot pH control settings, sample interval and control parameter, the CPU module of PLC control system obtains the current real-time pH value of chemical combination slot by Analog input mModule, controlling value is calculated by PID again, controlling value is transferred to regulating valve by analog output module, make regulating valve according to controlling value controlling opening of valve, pulp discharge quantity is controlled, realizes the stability contorting of chemical combination slot pH value.On-line pH value automatic collection, actual pH deviation compensations, pH desired value amendments, production process automatic adjustment pH value to optimized scope can be realized using the present invention.

Description

EMD Continuous leaching process chemical combination slot pH value control devices and its control method
Technical field
The present invention relates to field of industrial automation control, more particularly to a kind of EMD Continuous leaching process chemical combination slot pH value control Device processed and its control method.
Background technology
In Continuous leaching process, generally six chemical combination slots in workshop section are leached, are connected two-by-two with overflow pipe between chemical combination slot, First is flowed back with the last one chemical combination slot by pumping.The pH controls of each reactive tank are the emphasis of entire production control And difficult point, continuously leach EMD(EMD is the abbreviation of electrolytic manganese dioxide)During the chemical combination of production, by chemistry in slot in technique The situation of reaction divides three phases the pH controls of leaching workshop section, and the pH controls in each stage must assure that the model in setting In enclosing, and reduce the fluctuation of pH value in each slot to the greatest extent.Each chemical combination slot is divided by the stage of reaction, the chemical combination slot pH of different phase Value has different technological parameter indexs, and pH value control degree of stability is to influence the weight of final EMD product qualities and production cost Want one of factor.
Current country EMD productions also substantially using manual sampling, then compare the measurement of chemical combination slot pH value according to test paper The result that draws adjusts discharge quantity.This method has the following problems:1st, pH value detection and regulation and control existence time interval, it is stagnant Property is big afterwards, and control is unstable, can cause situation about adjusting back repeatedly;2nd, manual sampling is susceptible to mistake;3rd, EMD compounding stages show Field bad environments, frequently sampling can be to influencing worker's health;4th, it is not easy to form creation data report, production process is not easy Management, causes end product quality unstable.The country also has some EMD manufacturing enterprises using online pH instrument come to chemical combination work PH value progress acquisition monitoring in real time in journey, but control still by the way of manual adjustment, product quality is affected by human factors Greatly, it is unstable.
The content of the invention
In order to solve the problems in the prior art, the purpose of the present invention is to provide a kind of EMD Continuous leaching process chemical combination slot pH It is worth control device and its control method, can realizes on-line pH value automatic collection, actual pH deviation compensations, pH desired value amendments, Production process automatically adjusts pH value to optimized scope.
The present invention to achieve the above object the technical solution adopted is that:A kind of EMD Continuous leaching process chemical combination slot pH value control Device processed, including PLC control system, operation panel, which is characterized in that PLC control system include CPU module and respectively with CPU Module connection DC24V DC power suppliers, ethernet communication module, Analog input mModule I, Analog input mModule II, Analog output module, digital quantity input module, digital output module, ethernet communication module are connected with operation panel, control Device processed further includes four online pH instrument, three solenoid valves, a sampling pump, three regulating valves, wherein an online pH instrument is set It puts in the overflow pipe between 1, No. 2 chemical combination slot, an online pH instrument is arranged in the overflow pipe between 3, No. 4 chemical combination slots, and one The online pH instrument of platform is arranged in the overflow pipe between 5, No. 6 chemical combination slots, the input terminals of three solenoid valves respectively with 1,3, No. 5 chemical combination Slot connects, and the output terminal of three solenoid valves is connected respectively with sampling pump, also has an online pH instrument to be connected to sampling pump rear end In pipeline, four online pH instrument are also connected with the Analog input mModule of PLC control system I respectively, three solenoid valves and sampling Pump is also connected with the digital quantity input module of PLC control system, digital output module respectively, and three regulating valves are connected to With the blanking pulp pot bottom of 1,3, No. 5 chemical combination slot, three regulating valves also Analog input mModule with PLC control system respectively II connects with analog output module.
The further year technical solution that the present invention uses is:The Analog input mModule I, Analog input mModule II divide It is not 12,8 tunnel 4-20mA Analog input mModules, analog output module is 12,8 tunnel 4-20mA analog output modules, Digital quantity input module is 16 railway digital amount input modules, and digital output module is 16 railway digital amount output modules.
Another technical solution for using to achieve the above object of the present invention is:A kind of EMD Continuous leaching process chemical combination slot pH It is worth control method, which is characterized in that the control method is come to each chemical combination slot using the control device described in the claims 1 PH value monitoring in real time and control, comprise the following steps:
(1)The pH controlling values of each chemical combination slot by technological requirement by operation panel are set, while are set by operation panel The deviation range of interval time, sampling pH value and on-line pH value that sampling pump rotation samples between three different chemical combination slots;
(2)Acquisition is connected to the on-line pH value of the online pH instrument between two neighboring chemical combination slot, acquisition sampling pump rear end The sampling pH value of online pH instrument in pipeline, the anti-deaf value of acquisition control valve opening, sampling pump and electromagnetic valve work state;
(3)The data of acquisition are by Analog input mModule I, Analog input mModule II, digital quantity input module conversion Into digital signal, CPU module is transferred to by the core bus of PLC control system, is calculated by information processing, and by PID Draw control output valve;
(4)By step(3)In obtained control output valve regulating valve, regulating valve root are sent to by analog output module Change the control of aperture realization pulp tank discharge quantity according to control output valve;
(5)PLC control system is communicated by ethernet communication module and operation panel, shows that pH is controlled on operation panel Value, sampling pH value, on-line pH value, control valve opening, sampling pump and electromagnetic valve work state.
EMD Continuous leaching process chemical combination slot pH value control device of the present invention and its control method have the advantages that:
1st, pH control stabilities are improved:After EMD Continuous leaching process chemical combination slot pH value control device of the present invention, eachization It closes slot pH value feedback and is no more than ± 0.3 with technological requirement pH value deviation, be configured with pH rotation sampling equipments(Sampling pump), timing Interval is sampled to be compared with on-line pH value, can effectively prevent online pH instrument due to pulp reaction solution blocks pH electrodes Measure wrong data;
2nd, control method achievees the effect that high-precision control using PID control stage by stage:
pH:Hydrogen ionexponent refers to the ratio of the amount of hydrionic sum and total material in solution, pH=- lg(H+)I.e. The negative value of the common logarithm of contained hydrogen ion concentration, so when pH is in the control range in 0-3 in EMD production technologies, The fluctuation of system front end input will not generate larger effect to controlled pH, and PID control response speed need not be too fast at this time, P systems Number needs to turn down, and prevents overshoot;And when pH is in the control range in 4-6, the fluctuation of system front end input can be to controlled PH generates larger effect, and PID control needs quick response at this time, and P coefficients need appropriate amplification;
3rd, the degree of automation and reliability are high, easy to operate:Use the EMD Continuous leaching process chemical combination slot pH value of the present invention During control device, each process data need to only be set in operation panel, control process is full automatic, and reliability is high, no It needs, using other equipment, to operate very convenient;
4th, man-machine interface is friendly:Man-machine interface, which is provided, to be supported to control to adjust window, warning window and report on Process flow diaphragm Table window etc., details show all information of the observable based on certain operation circuit, and detail display panel is included each A circuit is for information about, detailed enough, so that operations staff can correctly be operated accordingly;For regulating loop, display Go out the adjustings such as setting value, process variable, output valve, the method for operation, high/low limit value, alarm condition, unit, circuit configuration data Parameter;For the circuit of digital output modul, then circuit configuration data and equipment state are shown;The instrumented data of PLC acquisitions is deposited It puts into industrial database, can check that historical data only need to be by calling in man-machine interface by being set for preserving for a long time Trend or report controls;
5th, control method uses current engineering widely used fuzzy-adaptation PID control in practice, and apparatus structure is simple, parameter Adjust that stability is good, reliable operation, easy to adjust, method simply uses.
With reference to the accompanying drawings and examples to EMD Continuous leaching process chemical combination slot pH value control device of the present invention and its control Method is further described.
Description of the drawings
Fig. 1 is EMD Continuous leaching process chemical combination slot pH value control device block diagram of the present invention;
The control principle block diagram of Fig. 2 EMD Continuous leaching process chemical combination slot pH value control methods of the present invention;
The rate-determining steps block diagram of Fig. 3 EMD Continuous leaching process chemical combination slot pH value control methods of the present invention.
Specific embodiment
As shown in Figure 1, EMD Continuous leaching process chemical combination slot pH value control device of the present invention, including PLC control system, behaviour Make panel, PLC control system includes CPU module and the DC24V DC power suppliers being connected respectively with CPU module, ether Netcom Interrogate module, Analog input mModule I, Analog input mModule II, analog output module, digital quantity input module, digital quantity Output module.Ethernet communication module is connected with operation panel, control device further include four online pH instrument, three solenoid valves, One sampling pump, three regulating valves, wherein an online pH instrument is arranged in the overflow pipe between 1, No. 2 chemical combination slot, one Line pH instrument is arranged in the overflow pipe between 3, No. 4 chemical combination slots, and an online pH instrument is arranged on the overflow between 5, No. 6 chemical combination slots Guan Zhong, the input terminal of three solenoid valves are connected respectively with 1,3, No. 5 chemical combination slot, the output terminals of three solenoid valves respectively with sampling pump Connection also has an online pH instrument to be connected in the pipeline of sampling pump rear end.Four online pH instrument also respectively with PLC control system Analog input mModule I connect, three solenoid valves and sampling pump also respectively with the digital quantity input module of PLC control system, Digital output module connects.Three regulating valves are connected to the blanking pulp pot bottom with 1,3, No. 5 chemical combination slot, three tune Section valve is also connected with the Analog input mModule of PLC control system II and analog output module respectively.
In the present embodiment, the Analog input mModule I, Analog input mModule II are 12,8 tunnel 4-20mA respectively Analog input mModule, analog output module are 12,8 tunnel 4-20mA analog output modules, and digital quantity input module is 16 Railway digital amount input module, digital output module are 16 railway digital amount output modules.CPU module passes through PLC backboards and 8 tunnels 12 Position 4-20mA Analog input mModules, 12,8 tunnel 4-20mA analog output modules, 16 railway digital amount input modules, 16 ways Word amount output module carries out data exchange.Online pH instrument exports 2 road 4-20mA signals by its internal transmitter(PH and temperature Signal)To 12,8 tunnel 4-20mA Analog input mModules.The digital output modul signal of solenoid valve and sampling pump is sampled to 16 ways Word amount inputs/goes out module.
3 regulating valves correspond to control No. 1, No. 3, No. 5 chemical combination slot discharge quantities(No. 2, No. 4, No. 6 are producing under normal circumstances Blanking, forward chemical combination slot overflow is not required), mounted on pulp pot bottom.Aperture is controlled by 12,8 tunnel 4-20mA analog outputs Module gives, and real-time open degree feedback value is sent into 12,8 tunnel 4-20mA Analog input mModules.
Online pH instrument selects plum Teller support benefit brands, can be applicable in 0-140 DEG C of working environment, and with automatic water gas washing Cleaning device is rushed, reaction solution is prevented to be attached to electrode surface, influences measurement accuracy.Closing is installed at overflow pipe in chemical combination slot Under the baffle do not closed, slot bottom reaction solution could enter overflow.Chemical combination slot bottom installation sampling solenoid valve and sampling pump, sampling pump 1 online pH instrument is installed on reflux line.Online pH instrument pick-up exports 4-20mA signals by shielded cable again through signal isolation It send to 12,8 tunnel 4-20mA Analog input mModules, carrying out A/D in inside modules is converted into ± 0 ~ 32768 digital signals, then root Actual measured value is converted into according to instrument measurement range.
Control valve opening signal is given by PLC control system, and 0-100% apertures Setting signal is through CPU programs conversion ± 0- 32768 digital signals are transferred to 12,8 tunnel, 4 ~ 20mA analog output modules by backboard, then carry out D/A and be converted into 4-20mA Signal output is to control valve opening receiving terminal.
Ethernet communication module is communicated from Ethernet and operation panel, by No. 1, No. 3, No. 5 chemical combination slot pH value & temperature, adjust Section valve opening, sampling solenoid valve, sampling pump working condition are sent by ICP/IP protocol to operation panel.It can be right in operation panel The parameters such as pH value & temperature, target pH controlling values, pH compensation ranges, sample interval are configured, and setting value will pass through TCP/ IP agreement is sent to CPU module.
The PLC that the present invention uses is the S7-300 series of PLC of west gate sub-brand name:DC24V DC power suppliers select model For PS307;CPU module selects model CPU315-2DP;Ethernet communication module selects model CP343-1 Lean;Simulation It measures input module and selects model SM331;Analog output module selects model SM331;Digital quantity input module selection type Number be SM321;Digital output module selects model SM321;Then PLC backboards are all inserted into, PLC backboards select model DIN guide rails;And PLC is installed and is fixed, mix various installations and connection attachment;Then the alternating current of AC220V is supplied to power module Do power supply.
Liquid crystal touch screen or PC computers quantity 1 can be selected in operation panel, passes through ethernet netting twine and the Ethernet of PLC Communication module connects.
A kind of conversion as the embodiment of the present invention:The PLC brands can be arbitrary brand, i.e., each module model is not With the model of the module of brand corresponding function;Online pH instrument brand can be arbitrary brand;But must possess normal at 0-140 DEG C Ability to work, and it is equipped with automatic flushing device.
EMD Continuous leaching process chemical combination slot pH value control method of the present invention please also refer to Fig. 2, shown in 3, the controlling party Method, to the monitoring in real time of each chemical combination slot pH value and control, is comprised the following steps using above-mentioned control device:
(1)The pH controlling values of each chemical combination slot by technological requirement by operation panel are set, while are set by operation panel The deviation range of interval time, sampling pH value and on-line pH value that sampling pump rotation samples between three different chemical combination slots;
(2)Acquisition is connected to the on-line pH value of the online pH instrument between two neighboring chemical combination slot, acquisition sampling pump rear end The sampling pH value of online pH instrument in pipeline, the anti-deaf value of acquisition control valve opening, sampling pump and electromagnetic valve work state are relatively more online PH value and sampling pH value, when deviation is less than setting deviation, then according to compensating approach in pH deviation ranges(Compensating approach method is Common method is not describing in detail herein), if more than setting deviation alarm, and current regulating valve is kept to export aperture, at this time may be used Sampling pH value is selected to substitute current slot real-time pH value and carries out PID adjustings;
(3)The data of acquisition are by Analog input mModule I, Analog input mModule II, digital quantity input module conversion Into digital signal, CPU module is transferred to by the core bus of PLC control system, according to current pH value and given pH value, CPU Module passes through information processing, and passes through PID and control output valve is calculated, and PID is calculated as known technology and is not chatting in detail herein It states;
(4)By step(3)In obtained control output valve regulating valve, regulating valve root are sent to by analog output module Change the control of aperture realization pulp tank discharge quantity according to control output valve;
(5)PLC control system is communicated by ethernet communication module and operation panel, shows that pH is controlled on operation panel Value, sampling pH value, on-line pH value, control valve opening, sampling pump and electromagnetic valve work state.

Claims (3)

1. a kind of EMD Continuous leaching process chemical combination slot pH value control device, including PLC control system, operation panel, feature exists In PLC control system includes CPU module and the DC24V DC power suppliers, the ethernet communication mould that are connected respectively with CPU module Block, Analog input mModule I, Analog input mModule II, analog output module, digital quantity input module, digital output Module, ethernet communication module are connected with operation panel, control device further include four online pH instrument, three solenoid valves, one Sampling pump, three regulating valves, wherein an online pH instrument is arranged in the overflow pipe between 1, No. 2 chemical combination slot, an online pH Instrument is arranged in the overflow pipe between 3, No. 4 chemical combination slots, and an online pH instrument is arranged on the overflow pipe between 5, No. 6 chemical combination slots In, the input terminal of three solenoid valves is connected respectively with 1,3, No. 5 chemical combination slot, and the output terminal of three solenoid valves connects respectively with sampling pump Connect, also have an online pH instrument be connected in the pipeline of sampling pump rear end, four online pH instrument also respectively with PLC control system Analog input mModule I connects, three solenoid valves and sampling pump also respectively with the digital quantity input module of PLC control system, number Word amount output module connects, and three regulating valves are connected to the blanking pulp pot bottom with 1,3, No. 5 chemical combination slot, three adjustings Valve is also connected with the Analog input mModule of PLC control system II and analog output module respectively.
2. EMD Continuous leaching process chemical combination slot pH value control device as described in claim 1, which is characterized in that the simulation Amount input module I, Analog input mModule II are 12,8 tunnel 4-20mA Analog input mModules respectively, analog output module It is 12,8 tunnel 4-20mA analog output modules, digital quantity input module is 16 railway digital amount input modules, digital output mould Block is 16 railway digital amount output modules.
3. a kind of EMD Continuous leaching process chemical combination slot pH value control method, which is characterized in that the control method is to utilize above-mentioned power Profit requires the control device described in 1 to the monitoring in real time of each chemical combination slot pH value and control, to comprise the following steps:
(1)The pH controlling values of each chemical combination slot by technological requirement by operation panel are set, while is set and sampled by operation panel Pump impeller changes the deviation range of the interval time sampled between three different chemical combination slots, sampling pH value and on-line pH value;
(2)Acquisition is connected to the on-line pH value of the online pH instrument between two neighboring chemical combination slot, the pipeline of acquisition sampling pump rear end In online pH instrument sampling pH value, the anti-deaf value of acquisition control valve opening, sampling pump and electromagnetic valve work state;
(3)The data of acquisition are converted into counting by Analog input mModule I, Analog input mModule II, digital quantity input module Word signal is transferred to CPU module by the core bus of PLC control system, by information processing, and passes through PID and is calculated Control output valve;
(4)By step(3)In obtained control output valve regulating valve is sent to by analog output module, regulating valve is according to control Output valve processed changes the control that aperture realizes pulp tank discharge quantity;
(5)PLC control system is communicated by ethernet communication module and operation panel, shown on operation panel pH controlling values, Sample pH value, on-line pH value, control valve opening, sampling pump and electromagnetic valve work state.
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JPH05122519A (en) * 1991-06-12 1993-05-18 Oki Electric Ind Co Ltd Peak hold circuit
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CN201464930U (en) * 2009-07-03 2010-05-12 何献忠 Automatic detection and control device for pH value
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CN103744445A (en) * 2013-12-14 2014-04-23 金川集团股份有限公司 Circulation-type automatic-cleaning pH measurement control device and method
CN203573181U (en) * 2013-11-21 2014-04-30 福建澳泰自动化设备有限公司 PH controller
CN203700002U (en) * 2013-12-17 2014-07-09 孙奎军 Device capable of automatically regulating pH value of tap water

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* Cited by examiner, † Cited by third party
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JPH05122519A (en) * 1991-06-12 1993-05-18 Oki Electric Ind Co Ltd Peak hold circuit
CN1071975A (en) * 1991-10-31 1993-05-12 福建师范大学 Produce the technology and the electrode special of electrolytic metal Mn with rich manganese slag and Manganous chloride tetrahydrate-ammonium chloride system
CN1598729A (en) * 2004-08-18 2005-03-23 哈尔滨工业大学 Automatic regulation control system for PH value of solution and its automatic control method
CN201464930U (en) * 2009-07-03 2010-05-12 何献忠 Automatic detection and control device for pH value
CN101892384A (en) * 2010-07-15 2010-11-24 广西有色金属集团汇元锰业有限公司 Method for producing mercury-free alkaline manganese electrolytic manganese dioxide
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CN202812387U (en) * 2012-07-24 2013-03-20 柳州高新区欧亚自动化设备有限责任公司 Constant pressure differential protecting control device for boiler water supply electric-control valve
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CN103744445A (en) * 2013-12-14 2014-04-23 金川集团股份有限公司 Circulation-type automatic-cleaning pH measurement control device and method
CN203700002U (en) * 2013-12-17 2014-07-09 孙奎军 Device capable of automatically regulating pH value of tap water

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